It's not a new or complicated hand sign. It is a simple hand gesture, often used to indicate measurement, as in, "I need six #10 bolts about this long," or something like that (I know all the implied penis-size jokes are there too, so we don't have to bore each other with those). I have a theory, though. It will sound like typical "conspiracy theory" stuff, but here it is.
I think the gesture is a hand-sign/secret code used by the neocon "Bushies" to indicate something to specific listeners when they are speaking in a public forum. I believe that when they are speaking, they are not addressing the general public or an interviewer, they are secretly speaking to a target-audience of socioeconomic & political elite, their "base" as Bush called them. The hand-sign is flashed to indicate to those listeners who are "in the know" that the phrase connected with the sign is to be interpreted a particular way, rather than literally. It might mean to use a predetermined code, or to simply use the opposite meaning, or whatever; I do not know the code. But I suspect it exists and that is what they are doing.
Remember, these are a bunch of secret-society frat-boy types, Skull-and-Bones members, etc. They are long accustomed to communicating through elitist signals; it only makes sense that they would employ that tried-and-true method throughout their lives' endeavors. And remember what I said about the gesture being used ordinarily to indicate measurement? At the risk of ridicule, I offer the notion that the use of such a gesture as a secret message could have masonic roots.
In any event, here are a few examples:
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I am dead serious. Can anyone tell me what is really going on with this?